1 // Code for manipulating VGA framebuffers.
3 // Copyright (C) 2009 Kevin O'Connor <kevin@koconnor.net>
4 // Copyright (C) 2001-2008 the LGPL VGABios developers Team
6 // This file may be distributed under the terms of the GNU LGPLv3 license.
8 #include "biosvar.h" // GET_BDA
9 #include "util.h" // memset_far
10 #include "vgabios.h" // find_vga_entry
11 #include "stdvga.h" // stdvga_grdc_write
14 /****************************************************************
16 ****************************************************************/
19 memcpy_stride(u16 seg, void *dst, void *src, int copylen, int stride, int lines)
21 for (; lines; lines--, dst+=stride, src+=stride)
22 memcpy_far(seg, dst, seg, src, copylen);
27 memset_stride(u16 seg, void *dst, u8 val, int setlen, int stride, int lines)
29 for (; lines; lines--, dst+=stride)
30 memset_far(seg, dst, val, setlen);
34 memset16_stride(u16 seg, void *dst, u16 val, int setlen, int stride, int lines)
36 for (; lines; lines--, dst+=stride)
37 memset16_far(seg, dst, val, setlen);
41 scroll_pl4(struct vgamode_s *vmode_g, int nblines, int attr
42 , struct cursorpos ul, struct cursorpos lr)
44 int cheight = GET_GLOBAL(vmode_g->cheight);
46 int stride = GET_BDA(video_cols) * cwidth;
47 void *src_far, *dest_far;
49 dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth);
50 src_far = dest_far + nblines * cheight * stride;
54 dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth);
55 src_far = dest_far - nblines * cheight * stride;
58 int cols = lr.x - ul.x + 1;
59 int rows = lr.y - ul.y + 1;
61 stdvga_grdc_write(0x05, 0x01);
62 dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols * cwidth
63 , stride, (rows - nblines) * cheight);
67 stdvga_grdc_write(0x05, 0x02);
68 memset_stride(SEG_GRAPH, dest_far, attr, cols * cwidth
69 , stride, nblines * cheight);
70 stdvga_grdc_write(0x05, 0x00);
74 scroll_cga(struct vgamode_s *vmode_g, int nblines, int attr
75 , struct cursorpos ul, struct cursorpos lr)
77 int cheight = GET_GLOBAL(vmode_g->cheight) / 2;
78 int cwidth = GET_GLOBAL(vmode_g->pixbits);
79 int stride = GET_BDA(video_cols) * cwidth;
80 void *src_far, *dest_far;
82 dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth);
83 src_far = dest_far + nblines * cheight * stride;
87 dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth);
88 src_far = dest_far - nblines * cheight * stride;
91 int cols = lr.x - ul.x + 1;
92 int rows = lr.y - ul.y + 1;
94 memcpy_stride(SEG_CTEXT, dest_far+0x2000, src_far+0x2000, cols * cwidth
95 , stride, (rows - nblines) * cheight);
96 dest_far = memcpy_stride(SEG_CTEXT, dest_far, src_far, cols * cwidth
97 , stride, (rows - nblines) * cheight);
101 memset_stride(SEG_CTEXT, dest_far + 0x2000, attr, cols * cwidth
102 , stride, nblines * cheight);
103 memset_stride(SEG_CTEXT, dest_far, attr, cols * cwidth
104 , stride, nblines * cheight);
108 scroll_lin(struct vgamode_s *vmode_g, int nblines, int attr
109 , struct cursorpos ul, struct cursorpos lr)
113 int stride = GET_BDA(video_cols) * cwidth;
114 void *src_far, *dest_far;
116 dest_far = (void*)(ul.y * cheight * stride + ul.x * cwidth);
117 src_far = dest_far + nblines * cheight * stride;
121 dest_far = (void*)(lr.y * cheight * stride + ul.x * cwidth);
122 src_far = dest_far - nblines * cheight * stride;
125 int cols = lr.x - ul.x + 1;
126 int rows = lr.y - ul.y + 1;
128 dest_far = memcpy_stride(SEG_GRAPH, dest_far, src_far, cols * cwidth
129 , stride, (rows - nblines) * cheight);
132 memset_stride(SEG_GRAPH, dest_far, attr, cols * cwidth
133 , stride, nblines * cheight);
137 scroll_text(struct vgamode_s *vmode_g, int nblines, int attr
138 , struct cursorpos ul, struct cursorpos lr)
142 u16 nbrows = GET_BDA(video_rows) + 1;
143 u16 nbcols = GET_BDA(video_cols);
144 int stride = nbcols * cwidth;
145 void *src_far, *dest_far = (void*)SCREEN_MEM_START(nbcols, nbrows, ul.page);
147 dest_far += ul.y * cheight * stride + ul.x * cwidth;
148 src_far = dest_far + nblines * cheight * stride;
152 dest_far += lr.y * cheight * stride + ul.x * cwidth;
153 src_far = dest_far - nblines * cheight * stride;
156 int cols = lr.x - ul.x + 1;
157 int rows = lr.y - ul.y + 1;
158 u16 seg = GET_GLOBAL(vmode_g->sstart);
160 dest_far = memcpy_stride(seg, dest_far, src_far, cols * cwidth
161 , stride, (rows - nblines) * cheight);
164 attr = (attr << 8) | ' ';
165 memset16_stride(seg, dest_far, attr, cols * cwidth
166 , stride, nblines * cheight);
170 vgafb_scroll(int nblines, int attr, struct cursorpos ul, struct cursorpos lr)
173 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
177 // FIXME gfx mode not complete
178 switch (GET_GLOBAL(vmode_g->memmodel)) {
181 scroll_text(vmode_g, nblines, attr, ul, lr);
185 scroll_pl4(vmode_g, nblines, attr, ul, lr);
188 scroll_cga(vmode_g, nblines, attr, ul, lr);
191 scroll_lin(vmode_g, nblines, attr, ul, lr);
197 /****************************************************************
198 * Read/write characters to screen
199 ****************************************************************/
202 write_gfx_char_pl4(struct vgamode_s *vmode_g
203 , struct cursorpos cp, struct carattr ca)
205 u16 nbcols = GET_BDA(video_cols);
209 u8 cheight = GET_GLOBAL(vmode_g->cheight);
221 u16 addr = cp.x + cp.y * cheight * nbcols;
222 u16 src = ca.car * cheight;
223 stdvga_sequ_write(0x02, 0x0f);
224 stdvga_grdc_write(0x05, 0x02);
226 stdvga_grdc_write(0x03, 0x18);
228 stdvga_grdc_write(0x03, 0x00);
230 for (i = 0; i < cheight; i++) {
231 u8 *dest_far = (void*)(addr + i * nbcols);
233 for (j = 0; j < 8; j++) {
235 stdvga_grdc_write(0x08, mask);
236 GET_FARVAR(SEG_GRAPH, *(volatile u8*)dest_far);
237 if (GET_GLOBAL(fdata_g[src + i]) & mask)
238 SET_FARVAR(SEG_GRAPH, *dest_far, ca.attr & 0x0f);
240 SET_FARVAR(SEG_GRAPH, *dest_far, 0x00);
243 stdvga_grdc_write(0x08, 0xff);
244 stdvga_grdc_write(0x05, 0x00);
245 stdvga_grdc_write(0x03, 0x00);
249 write_gfx_char_cga(struct vgamode_s *vmode_g
250 , struct cursorpos cp, struct carattr ca)
252 u16 nbcols = GET_BDA(video_cols);
256 u8 *fdata_g = vgafont8;
257 u8 bpp = GET_GLOBAL(vmode_g->pixbits);
258 u16 addr = (cp.x * bpp) + cp.y * 320;
259 u16 src = ca.car * 8;
261 for (i = 0; i < 8; i++) {
262 u8 *dest_far = (void*)(addr + (i >> 1) * 80);
269 data = GET_FARVAR(SEG_CTEXT, *dest_far);
271 for (j = 0; j < 8; j++) {
272 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
274 data ^= (ca.attr & 0x01) << (7 - j);
276 data |= (ca.attr & 0x01) << (7 - j);
280 SET_FARVAR(SEG_CTEXT, *dest_far, data);
285 data = GET_FARVAR(SEG_CTEXT, *dest_far);
287 for (j = 0; j < 4; j++) {
288 if (GET_GLOBAL(fdata_g[src + i]) & mask) {
290 data ^= (ca.attr & 0x03) << ((3 - j) * 2);
292 data |= (ca.attr & 0x03) << ((3 - j) * 2);
296 SET_FARVAR(SEG_CTEXT, *dest_far, data);
304 write_gfx_char_lin(struct vgamode_s *vmode_g
305 , struct cursorpos cp, struct carattr ca)
307 // Get the dimensions
308 u16 nbcols = GET_BDA(video_cols);
312 u8 *fdata_g = vgafont8;
313 u16 addr = cp.x * 8 + cp.y * nbcols * 64;
314 u16 src = ca.car * 8;
316 for (i = 0; i < 8; i++) {
317 u8 *dest_far = (void*)(addr + i * nbcols * 8);
320 for (j = 0; j < 8; j++) {
322 if (GET_GLOBAL(fdata_g[src + i]) & mask)
324 SET_FARVAR(SEG_GRAPH, dest_far[j], data);
331 write_text_char(struct vgamode_s *vmode_g
332 , struct cursorpos cp, struct carattr ca)
334 // Get the dimensions
335 u16 nbrows = GET_BDA(video_rows) + 1;
336 u16 nbcols = GET_BDA(video_cols);
338 // Compute the address
339 void *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
340 + (cp.x + cp.y * nbcols) * 2);
343 u16 dummy = (ca.attr << 8) | ca.car;
344 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u16*)address_far, dummy);
346 SET_FARVAR(GET_GLOBAL(vmode_g->sstart), *(u8*)address_far, ca.car);
351 vgafb_write_char(struct cursorpos cp, struct carattr ca)
354 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
358 // FIXME gfx mode not complete
359 switch (GET_GLOBAL(vmode_g->memmodel)) {
362 write_text_char(vmode_g, cp, ca);
366 write_gfx_char_pl4(vmode_g, cp, ca);
369 write_gfx_char_cga(vmode_g, cp, ca);
372 write_gfx_char_lin(vmode_g, cp, ca);
378 vgafb_read_char(struct cursorpos cp)
381 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
385 if (!(GET_GLOBAL(vmode_g->memmodel) & TEXT)) {
387 dprintf(1, "Read char in graphics mode\n");
391 // Get the dimensions
392 u16 nbrows = GET_BDA(video_rows) + 1;
393 u16 nbcols = GET_BDA(video_cols);
395 // Compute the address
396 u16 *address_far = (void*)(SCREEN_MEM_START(nbcols, nbrows, cp.page)
397 + (cp.x + cp.y * nbcols) * 2);
398 u16 v = GET_FARVAR(GET_GLOBAL(vmode_g->sstart), *address_far);
399 struct carattr ca = {v, v>>8, 0};
403 struct carattr ca2 = {0, 0, 0};
408 /****************************************************************
410 ****************************************************************/
413 vgafb_write_pixel(u8 color, u16 x, u16 y)
416 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
419 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
422 u8 *addr_far, mask, attr, data;
423 switch (GET_GLOBAL(vmode_g->memmodel)) {
426 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
427 mask = 0x80 >> (x & 0x07);
428 stdvga_grdc_write(0x08, mask);
429 stdvga_grdc_write(0x05, 0x02);
430 GET_FARVAR(SEG_GRAPH, *(volatile u8*)addr_far);
432 stdvga_grdc_write(0x03, 0x18);
433 SET_FARVAR(SEG_GRAPH, *addr_far, color);
434 stdvga_grdc_write(0x08, 0xff);
435 stdvga_grdc_write(0x05, 0x00);
436 stdvga_grdc_write(0x03, 0x00);
439 if (GET_GLOBAL(vmode_g->pixbits) == 2)
440 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
442 addr_far = (void*)((x >> 3) + (y >> 1) * 80);
445 data = GET_FARVAR(SEG_CTEXT, *addr_far);
446 if (GET_GLOBAL(vmode_g->pixbits) == 2) {
447 attr = (color & 0x03) << ((3 - (x & 0x03)) * 2);
448 mask = 0x03 << ((3 - (x & 0x03)) * 2);
450 attr = (color & 0x01) << (7 - (x & 0x07));
451 mask = 0x01 << (7 - (x & 0x07));
459 SET_FARVAR(SEG_CTEXT, *addr_far, data);
462 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
463 SET_FARVAR(SEG_GRAPH, *addr_far, color);
469 vgafb_read_pixel(u16 x, u16 y)
472 struct vgamode_s *vmode_g = find_vga_entry(GET_BDA(video_mode));
475 if (GET_GLOBAL(vmode_g->memmodel) & TEXT)
478 u8 *addr_far, mask, attr=0, data, i;
479 switch (GET_GLOBAL(vmode_g->memmodel)) {
482 addr_far = (void*)(x / 8 + y * GET_BDA(video_cols));
483 mask = 0x80 >> (x & 0x07);
485 for (i = 0; i < 4; i++) {
486 stdvga_grdc_write(0x04, i);
487 data = GET_FARVAR(SEG_GRAPH, *addr_far) & mask;
493 addr_far = (void*)((x >> 2) + (y >> 1) * 80);
496 data = GET_FARVAR(SEG_CTEXT, *addr_far);
497 if (GET_GLOBAL(vmode_g->pixbits) == 2)
498 attr = (data >> ((3 - (x & 0x03)) * 2)) & 0x03;
500 attr = (data >> (7 - (x & 0x07))) & 0x01;
503 addr_far = (void*)(x + y * (GET_BDA(video_cols) * 8));
504 attr = GET_FARVAR(SEG_GRAPH, *addr_far);